Journals / Meandros Medical And Dental Journal / 2026 / Volume: 27 Issue: 2

Comparative Analysis of Trastuzumab-Based Treatment in Advanced Gastric Cancer: Impact of HER2 Expression Levels

İleri Evre Mide Kanserinde Trastuzumab Tabanlı Tedavinin Karşılaştırmalı Analizi: HER2 Ekspresyon Düzeylerinin Etkisi

Ali Aytaç(University of Health Science, Şanlıurfa Mehmet Akif İnan Training and Research Hospital)0000-0001-9753-8517
Ahmet Avcı(Institutional affiliation: Beşiri State Hospital, Internal Medicine)0000-0003-1678-5896
Bilgin Demir(Aydın Adnan Menderes University Faculty of Medicine, Department of Internal Medicine, Division of Medical Oncology,)0000-0003-4380-9419
Esin Oktay(: Aydın Adnan Menderes University Faculty of Medicine, Department of Internal Medicine, Division of Medical Oncology)0000-0002-5974-6339
Pages
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Publication Date
2026-06-24
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The study's findings revealed no significant differences in treatment efficacy between the two HER2-positive groups.

📌 3 Key Takeaways

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Objective & Hypothesis:This retrospective study provides valuable insights into the impact of HER2 status on treatment outcomes in advanced gastric cancer patients receiving first-line chemotherapy plus trastuzumab.
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Key Findings & Data:The research focused on comparing two groups of HER2-positive patients: those with IHC 2+/FISH positive status and those with IHC 3+ status.
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Conclusion & Impact:The study's findings revealed no significant differences in treatment efficacy between the two HER2-positive groups.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:: Advanced gastric cancer · Trastuzumab · HER2 expression

Abstract

This retrospective study provides valuable insights into the impact of HER2 status on treatment outcomes in advanced gastric cancer patients receiving first-line chemotherapy plus trastuzumab. The research focused on comparing two groups of HER2-positive patients: those with IHC 2+/FISH positive status and those with IHC 3+ status. The study's cohort consisted of 144 patients, with 45 (31.3%) identified as HER2 positive. Among the HER2-positive patients, 12 (26.7%) were classified as IHC 2+/FISH positive, while 33 (73.3%) were classified as IHC 3+. The researchers assessed diverse clinical and pathological aspects, encompassing patient characteristics, neoplasm positioning, and histological variants. They also explored therapeutic outcomes and long-term survival data. The study's findings revealed no significant differences in treatment efficacy between the two HER2-positive groups. Objective response rates and disease control rates were comparable, with 50% vs. 75% vs. 51.5% and 75.8%, respectively (p=0.946). Progression-free survival was similar, with a median of 8.5 months in the IHC 2+/FISH positive group and 9.6 months in the IHC 3+ group (p=0.87). Overall survival also showed no statistically significant difference, with median durations of 13.2 months and 16.2 months for the IHC 2+/FISH positive and IHC 3+ groups, respectively (p=0.38). These results suggest that the efficacy of first-line chemotherapy plus trastuzumab in advanced gastric cancer is comparable across different HER2-positive statuses, indicating that this treatment approach may be equally effective for patients with either IHC 2+/FISH positive or IHC 3+ HER2 status. This information is crucial for clinicians in making informed decisions regarding treatment strategies for HER2-positive advanced gastric cancer patients.

Özet

Bu retrospektif çalışma, ileri evre mide kanseri hastalarında birinci basamak kemoterapiye trastuzumab eklenmesinin tedavi sonuçlarına HER2 durumunun etkisi hakkında önemli bilgiler sunmaktadır. Araştırma, HER2 pozitif hasta popülasyonunda, IHC 2+/FISH pozitif olanlar ile IHC 3+ olan grubu karşılaştırmaya odaklandı.Çalışma kohortunu 144 hasta oluşturdu, bunların 45’inde (%31,3) HER2 pozitif saptandı. HER2 pozitif hastaların 12’si (%26,7) IHC 2+/FISH pozitif, 33’ü (%73,3) ise IHC 3+ olarak sınıflandırıldı. Araştırmacılar; hasta özellikleri, tümörün konumu ve histolojik varyantlar dâhil olmak üzere çeşitli klinik ve patolojik faktörleri değerlendirdi. Ayrıca tedavi sonuçları ve uzun vadeli sağkalım verileri de incelendi. Çalışmanın bulguları, iki HER2 pozitif grup arasında tedavi etkinliği açısından anlamlı bir fark olmadığını gösterdi. Objektif yanıt oranları ve hastalık kontrol oranları, sırasıyla %50 ve %75’e karşı %51,5 ve %75,8 ile karşılaştırılabilir düzeydeydi(p=0,946). Progresyonsuz sağkalım süreleri benzer çıktı; IHC 2+/FISH pozitif grupta medyan 8,5 ay, IHC 3+ grupta ise 9,6 ay olarak bulundu(p=0,87). Genel sağkalımda da istatistiksel olarak anlamlı bir fark gözlenmedi; medyan süreler sırasıyla IHC 2+/FISH pozitif ve IHC 3+ gruplarında 13,2 ay ve 16,2 ay saptandı(p=0,38). Bu sonuçlar, ileri evre mide kanserinde birinci basamak kemoterapiyle birlikte trastuzumab tedavisinin farklı HER2 pozitif gruplarında benzer etkinlikte olduğunu göstermekte, bu yaklaşımın hem IHC 2+/FISH pozitif hem de IHC 3+ hastalarda eşit derecede etkili olabileceğini düşündürmektedir. Bu bilgiler, klinisyenlerin HER2 pozitif ileri evre mide kanseri hastaları için tedavi stratejileri konusunda bilinçli kararlar almalarına yardımcı olacak niteliktedir.

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Cite This Article

Aytaç, A., Avcı, A., Demir, B., Oktay, E. (2026). Comparative Analysis of Trastuzumab-Based Treatment in Advanced Gastric Cancer: Impact of HER2 Expression Levels. Meandros Medical And Dental Journal, Volume: 27 Issue: 2. https://doi.org/10.69601/meandrosmdj.1790631

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